Calculating machine



Sept. 1, 1953 A. B. MACHADO 2,650,761

CALCULATING MACHINE Filed May v27, 1950 14 Sheets-Sheet l Sept. 1, 1953 A. B. MACHADO CALCULATING MACHINE 14 Sheets-Sheet 2 Filed May 27, 1950 INVENTOR. ANTaoNY B MAcHAoa A TORNEY Sept. 1, 1953 A. B. MACHADOl CALCULATING MACHINE 14 Sheets-Sheet 3 Filed May 27, 1950 FIS-EE- INVENTOR. ANH-ouv B. Mn'cmmo ATT NEY Sept- 1, 1953 A. B. MACHADO 2,650,761

CALCULATING MACHINE Filed May 27, 1950 14 Sheets-Sheet 4 FIEL-:EA

IN VENTOR ANTHQNY B. MAcHAno 14 Sheets-Sheet 5 JNVENTOH. MAcnAuo ATTORNEY A. B. MACHADO CALCULATING MACHINE A11- mmv B.

Sept. l, 1953 Filed may 27, :195o

Sept. 1, 1953 A. B. MACHADO CALCULATING MACHINE 14 Sheets-Sheet 6 Filed May 27, 1950 Lzou FIS-q:

Y INVENTOR ANTHQNY B. MHCHHDG A ORNEY A. B. MACHADO CALCULATING MACHINE Sept. l, 1953 14 Sheets-Sheet 7 Filed May 27, 1950 INVENToR. Anrnonv B. Mmmmov ATTORNEY Sept. 1, 1953 A. B. MACHADO 2,650,761

CALCULATING MACHINE Filed May 27, 1950 14 Sheets-Sheet 8 INVENTOR ATTORNEY A. B. MACHADO CALCULATING MACHINE Sept. 1, 1953 14 SheetS-Shee'b 9 Filed May 27, 1950 mlm-Hlm INVENTOR. M fummo Aun-mmv B.

ATTORNEY Sept- 1, 1953 A. a. MACHADO 2,650,761

CALCULATING MACHINE Filed May 27, 1950 14 Sheets-Sheet lO FIL-- lm INVENTOR. ANTHoNY B. MAcHAo Sept. 1, 1953 A. B. MACHADO CALCULATING MACHINE 14 Sheets-Sheet 1l Filed May 27, 1950 INVENTOR Anmonv E. Mncunoo BY TTORNEY 14 snetssheei 12 INVENTOR NMa-Ano AN'rMoNY B.

ATTORNEY A. B. MACHADO CALCULATING MACHINE Sept. `1, 1953 Filed May 27, 1950 Sept- 1, 1953 A. B. MAcHADo 2,650,761

CALCULATING MACHINE Filed May 27, 1950 14 Sheets-Sheet l5 INVENTOR.

ANTMQNY B. MAcHADo Sept. 1, 1953 A. B. MACHADO CALCULATING MACHINE l4Sheets-Shee't 14 Filed May 27, 1950 INVENTOR AN'rHoNv B. Mncnmo BY Patentecl Sept. l, 1953 CALCULATING MACHINE Anthony B. Machado, San Leandro, Calif., as-

signor to Friden Calculating Machine Co., Inc., a corporation of California Application May 27, 1950, Serial No. 164,765

19 Claims.

1 This invention relates to calculating machines and particularly machines which are adapted to perform addition, subtraction, multiplication and division. This application is a continua- ,tion-in-part of application S. N. 2,663 filed January 16, 1948, and abandoned on February 8, 1951, in favor of application S. N. 207,782, led January 25, 1951, which is a division of application S. N. 666,966 iiled May 3, 1946, now abandoned.

For purposes of disclosure the invention will be shown embodied in a machine of the type disclosed in the following patents: Patent No. 2,229,890 issued to Carl M. F. Friden on January 28, 1941 for Automatic Division; Patent No. 2,363,737 issued to Anthony B. Machado on November 28, 1944 for Dividend Entry and Return Clear; Patent No. 2,371,752 issued to Carl M. Friden on March 20, 1945 for Automatic Multiplication; Patent No. 2,399,917 issued to Carl M. Friden and Anthony B. Machado on May 7, 1946 for Improved Automatic Multiplication; Patent No. 2,427,271 of Carl M. Friden and Anthony B. Machado dated September 9, 1947 for Rapid Correction.

Parts of the mechanism disclosed in the above patents associated with the mechanism of this invention are disclosed herein in order to show the environment of the novel structure. For a full disclosure of any of these mechanisms reference is to be had to the patents cited.

Objects An object of the invention is to lighten the key touch on certain operation control keys, that is, mechanism is provided which reduces the amount of pressure the operator is required to exert on the key.

Another object of the invention is to utilize a single unitary mechanism under the control of a plurality of operation control keys for performing a plurality of functions.

Another object of the invention is to provide a mechanism for automatically causing a return clear operation, that is, closure of the motor switch, engagement of the main clutch, engagement of the left shift clutch and engagement of the clutch which transmits drive to the mechanism for resetting the accumulator and revolutions counter to zero when the carriage arrives at its left-hand position.

Other objects will be evident after the following disclosure in which:

Fig. l is a perspective View of the machine in which the invention is embodied.

Figs. 2A and 2B taken together comprises a vertical longitudinal section thru the machine, the plane of the section is indicated by the line 2 2 in Fig. 1.

Fig. 3A and 3B taken together constitute a transverse section taken as indicated by the line 3-3 in Figs. 2A and 2B.

Fig. 4 is a View similar to Fig. 3B in which certain parts have been omitted and other parts have been added.

Fig. 5 is a fragmentary sectional view showing the power setting unit, the location of the section is indicated by the lines 5 5 in Fig. 3B.

Fig. 6 is a View taken on the other side of the unit, the location of the section being indicated by the line 6 6 in Fig. 3B.

Fig. 7 is a sectional view with parts omitted to show mechanism associated with the dividend entry and the return clear key, the location of the section is indicated on line in Fig. 1.

Fig. 8 is a section similar to that in Fig. 7 but with certain parts omitted and others added for the sake of clarity.

Fig. 9 is a View taken from the other side of the frame on which the parts of Fig. 8 are mounted.

Fig. 10 is a fragmentary longitudinal section taken as indicated by the line Ill-I0 in Fig. 1.

Fig. 11 is a vertical section taken as indicated by the line in Fig. l.

Fig. 12 is a vertical section taken as indicated by the line |2-I2 in Fig. 1.

Fig. 13 is a fragmentary View of certain parts shown in Fig. 12 in a diierent position.

Fig. 14 is a vertical section taken as indicated by the line |4-I4 in Fig. 1.

General description Referring to Figure 1, the machine is provided with a main keyboard |00 in which the operator sets the values which are to be registered in the accumulator I0 I. The number of registrations is counted in the revolutions counter |02. Both the accumulator |0| and the counter |02 are disposed in a shiitable carriage |03. Shifting of the carriage is controlled by manipulation of left and right shift keys |04, |05, respectively. Positive and negative registration of the values set in the beyboard |00 is controlled by plus and minus keys |06, |01.

Keyboard |00 may be manually corrected by depression of keyboard clear key |09. Add key IIO when preset in a depressed position causes the keyboard |00 to be automatically cleared at the conclusion of an operation. Values registered in the accumulator may be manually cleared therefrom by means of knob Ill, and values registered in the counter |02 may be manually cleared therefrom by means of knob H2. An automatic return clear operation can be initiated by depressing return clear key |3 which causes the carriage to be shifted by power to the left-end position where the accumulator and counter clear mechanisms may be automatically operated.

Automatic division operation may be initiated by depressing control keys ||4. For a full disclosure of the mechanism controlled by the automatic division key reference is lto be had to the patent to Friden No. 2,229,890. To facilitate the performance of a division operation a dividend entry key H5 is provided and also tabulator keys I IB on the carriage |03. to enter the dividend in a pre-determined ordinal position of the carriage the appropriate tabulator key ||6 is depressed, then the operator sets the dividend value in the keyboard |93 and depresses the dividend entry key ||5 which initiates an automatic operation which comprises first, a re- 'y turn clear operation followed by a right shift to the position determined by the depressed tabulator key ||i where the dividend value set in the keyboard |00 is automatically entered in the accumulator |0|. For a full disclosure of this mechanism reference is to be to Machado 2,363,737 referred to above.

Referring now to the automatic multiplier side of the machine. A ten key keyboard |2| is provided by means of which the multiplier value is set in a control mechanism which includes indicator dials |22 in which the multiplier value set by means of keyboard |2| is indicated. In connection with the automatic multiplier mechanism four operation control keys are provided. The key |23 when depressed causes a return clear operation followed by the automatic multiplication in which the multiplicand registered in the keyboard |00 is registered in the accumulator |0| and the multiplier indicated in the dials |22 is registered in the counter |02, the carriage shifting automatically to the right as multiplication by each digit is concluded. The control key |24 initiates an operation similar to the key |23 eX- cept that the accumulator |0| does not clear. This key is employed whenever it is desired to preserve the figure registered in the accumulator |0| at the outset of the multiplication operation. A key |25 initiates an operation similar to that of the key |24 except that the registration is negative instead of positive, that is, in eifect the product of the multiplicand set in the keyboard |00 and the multiplier set in the dials |22 is subtracted from whatever value stands in the accumulator |0| at the beginning of the operation. In case the koperator decides to change the multiplier figure appearing in the dials |22 before starting a multiplying operation either because the figure was erroneously set up by means of the keyboard |2 or for some other reason, the operator depresses the key |20 which causes the value to be cleared out of the multiplier control mechanism and to condition the mechanism for reentry of another value by means of the keys |2l. For a complete disclosure of the automatic multiplication mechanism reference is to be had to the patent to Frden 2,371,752 and also to the patent to Friden et al. 2,399,917 and for an improved mechanism controlled by the key |26 reference is to be had to the Patent 2,427,271 of Friden et al.

When it is desired had to the patent General construction Frame work of the machine comprises a base |33 (Fig, 7) at the right side of which is mounted a vertical frame plate |3|, and at the left side is mounted a vertical frame plate |32 (Figs. 3A and 3B). Intermediate the side frames |3I, |32 are frontand rear bearing plates |33, |34 (Figs. 3A and 3B). These parts comprise the main frame work of the machine and are supplemented by additional sub-frames. Supported in the front part of the frame Work is the keyboard |00 (Fig. 2A). In each ordinal row of keys, wellknown means is provided whereby depression of a selected numeral key adjusts an associated selector gear |35 relatively to a segmental differentially stepped tooth actuator drum or gear |35 secured to an actuator shaft |31. After adjustment of the gears |35 rotation of actuator shaft |31 causes the segmental gear |33 to engage theV selector gear |35 which is rotated a differential amount corresponding to the number of the key depressed. The selector gears |35 are mounted on a square shaft |30 which has a pair of bevel gears |39, |43 (Fig. 2B) thereon. The bevel gears |39, are inter-connected by a sleeve |4|. Transversely extending gate |42 serves to shift all of the sleeves |4| forwardly or rearwardly from their normal central position shown to engage the bevel gear |40 with the numeral wheel gear |43 or to engage the bevel gear |39 with the numeral wheel gear |43 to determine positive or negative registration in the accumulator.

Means for rotating the actuator shafts |31 comprises a transversely extending main drive shaft |45 (Fig. 3A and 3B) which is connected to the actuator shafts |31 by bevel gears |46, |41. The means for rotating the main drive shaft |45 comprises the motor |48 (Fig. 2B) connected by a train of gears |49, |50, |51 (Fig. 8) to a pawl and ratchet clutch |52 the driven side of which is secured to the main drive shaft |45. Cyclic rotation of the drive shaft is determined by operation of a clutch control lever |53 (Fig. 8) pivotally mounted on the frame |3| at |54 and connected by a link |55 to a lever |56 pivoted at |51 on the frame |3I. The lever |55 has a pin and slot connection |53 to a lever |59 pivoted at |00. Lever |59 has a fiber roller |6| for closing the contacts of the motor switch |62. Accordingly, whenever the roller IBI (Fig. 8) is moved rearwardly to close the switch |62 the lever |53 is rocked to cause engagement of the clutch and the main drive shaft is rotated until the parts are released and permitted to be returned to the position shown in Figure 8 under the influence of spring |63.

Well-known means is provided for shifting the carriage |03 which comprises a pin wheel |10 (Figs. 2B and 3B) which engages a rack on the carriage and can be selectively rotated in either direction to cause right or left shift by selectively engaging jaw clutches |1|, |12 respectively. The drive side of each clutch is non-rotatably but slidably mounted on an actuator shaft |31. The right shift clutch |1| is engaged by moving the push rod |13 rearwardly which has a fork |14 thereon engaging a groove in the slidable element of the clutch. A spring |15 normally urges the push rod forwardly to maintain the clutch disengaged. Similarly, the left shift clutch |12 is controlled by means of push rod |16.

A well-known means is provided for transmitting power to the clear mechanism for the accumulator and counter. This comprises a jaw amici Power setting unit It will be recalled, referring to Figure l, that three of the operation control keys, i. e., return clear key ||3, dividend entry key and the multiplication key |23 all cause a return clear operation, that is, a shift of the carriage to the left end position Where the accumulator is cleared.

For that reason the construction and operation of the power setting unit will be described in connection with the return clear key ||3.

Referring to Figure 7, return clear key ||3 is slidably mounted on studs |83 and |84 and when depressed is held down by means of a latch |85 in a well-known manner. Disposed in an aperture |86 in the key stem is a roller |61 on a bellcrank 88 which is connected by a link |89 to a bellcrank |90 thru a pin and slot connection |9I. The link |89 is normally urged rearwardly by means of a spring |92 which urges the bellcrank |88 counter-clockwise tending to raise the key. I

Clockwise rotation of the bellcrank |90 causes clockwise rotation of the shaft 200 by engagement of a roller 20| on the bellcrank with the arm 202 of a lever 203 secured to the shaft 200. The clockwise rocking of the shaft 200 is utilized to close the switch to the motor and to engage the clutch. The mechanism for this is shown in Fig. 9. An arm 264 is pinned to the shaft 206. The arm 264 has a cam face 265 engaging the roller |6| mounted on the lower end of the two arm lever |59 (Fig. 8). The rocking of the shaft 260 causes the surface 265 to cam the roller |6| to close the switch |62'and to rock the clutch dog |53, thereby permitting the clutch to become engaged.

The mechanism for lightening the key touch on the operation control keys is also associated with shaft 280, and is shown particularly in Figs.5 and 6. It will be recalled that depression of the return clear key |3, as is true of the other control keys involved herein, rocks the shaft'200,

clockwise in Figs. 6 and '7 and counter-clockwise in Fig. 5. A bellcrank 500 is pinned to the shaft l20|), in a plane adjacent the left shift clutch push rod |16 (Fig. 3B) The bellcrank 500 has a lower arm 50| which is provided with a stud 502 for the purposes hereinafter mentioned, an an upper arm 503 which is provided with a stud 504. The stud 504 is embraced in a slot 505 in one end of'link 506, a spring 501 connecting stud 504 to the turned-over ear 508 on the adjacent end of 'the link 506. The other-end of link 506 is pinned to an arm 5|0 of a hook member 5H, by any suitable means such as rivet 5 2. The hook member 5| is rotatably mounted on an eccentric 5|3 pinned to the shaft 259. The hook member is provided with a second arm 5 I4, the outer end of which is provided with a hook 5|5.

The shaft 259, `iust mentioned, is connected at `its left end (Fig. 3A), by means of bevel gears `26) to a shaft 26| which in turn is connected by bevel gears 262 (Fig. l2), to main drive shaft |45. By this means the shaft 259 is rotated in synchronism with the main drive shaft. It is thus obvious that the hook member 5|| continuously rocks on its eccentricvmounting in synchronism with the main drive 'shaft whenever the main clutch |52 is engaged and the motor is running. l l

A bellcrank 520 is pinned to a. shaft 250 in a plane immediately adjacent to that of the hook 5|5. The upper arm 52| of the bellcrank is provided with a stud 522 which, when the hook member 5|| is rocked clockwise through rockingvof the shaft 200, will be engaged by the hook 5|5 during its continuous reciprocation. However, when the shaft 200 is in its normal setting, the counterclockwise position shown in Fig. 6,k the reciprocating hook 5|5 cannot engage the stud 522. When the hook 5| 5 is rocked to its operative position (clockwise of that shown in Fig. 6) vthe hook, at its extreme leftward travel will engage the stud 522 and thereupon will rock the bellcrank 520 and the shaft 250 clockwise. It .will be understood that the hook 5 5 is effectiveto pull bellcrank 520 and shaft 250 clockwise only after the member 5|| has been rocked clockwise on its eccentric, for otherwise the hook will not travel in a path which will bring it into engagement with stud 522. 1

The lower arm 523 of the bell crank 520 is provided with a latching stud 524. Associated with the latching stud 524 is a latching member, 525 pivotally mounted on a pin 252 supportcd by the bracket member 526. The latch 525 is pulled counterclockwise by a spring 521 tensionedbetween it and the bracket 526. The latch has a shoulder 528 adapted to engage the lpin 524 on the arm 523, thereby latching the belicrank 520 and shaft 250 in the operative (clockwise in Fig. 6) position, thus locking the shaft in its clutchengaging position. The latch member 525 is also provided with extension 529 which is engaged by the pin 502 on the bellcrank 500 when the bellcrank and its shaft 200 are rocked in a counterclockwise direction (in Fig. 6), thereby unlatching the latch 525 and releasing the shaft 250 for counterclockwise rotation. As the bellcrank 520 is locked in its rocked position by the latch 525, the rocking of the eccentrically-mounted hook 5| is effective to pull it to its extreme latched position and is thereafter disengaged therefrom during substantially the entire part of each cycle of operation. v

It will be recalled that depression of the return clear key ||3 (Fig. 7) causes rotation ofAV the shaft 200 which resulted in the shaft 250'being rocked to its operative position. Rocking ofthe shaft 250 causes engagement of the left shift clutch and the clear clutch as will now be explained. Referring to Fig. l0 the shaftj250 has an arm 266 secured thereto, on which a pusher arm 268 is pivoted by any suitable means, such as pin 261. The pusher arm 268 has a shoulder 269 engaging a pin 210 on an arm 21| which is secured to sleeve 212 rotatably mounted on a shaft 213 (see also Fig. 3B). Sleeve 212 also carries an arm 214 having a pin 215 thereon which engages the left shift push rod |16 (Figs.A 2A and 3B). This, it will be recalled, causes engagement of the left shift clutch |12 and causes the carriage to be shifted to the left. The clear clutch is engaged as follows: Referring to Fig. 1l shaft 250 has secured thereto an arm 280, which arm carries a pusher arm 28| pivotally mounted thereon at 282. The pusher arm 28| engages the push rod |80 so that rocking of the shaft 250 also causes engagement of the clear clutch |11 (Fig. 3A). After the conclusion of the return clear operation, a well-known mechanism causes operation lpush rod -spective clutches under tions mechanism cause entry ofthe 2,08 to withdraw the latch 1:1., nary to initiating .key |23 Causes previously described, the power setting unit acciones ofthe latch |35 (Fig. 7) to release the return clear key ||3. This results in a return of the link |89 under the influence of its spring |92 to its original position. Such movement of link |89 permits return of the bellcrank |90 under the influence of its spring 283 to its original position, thus, permitting the shaft 200 to rock counterclockwise (Fig. 7) under the influence of spring 284 (Figl 14) attached to an arm 205 secured thereto. Counter-clockwise rotation of the shaft 200 causes unlatching of the arm 525 by reason of engagement of the pin 502 on the arm 50| with the latch 525, for as the shaft 200 and its bellcrank 500 move counterclockwise (Fig. 6) the pin 502 lifts the latch 525 oi the pin 524 of the 'arm 523. The lifting of the latch 525 permits the bellcrank 520 to rock counter-clockwise, and, as it is pinned to shaft 250, the shaft 250 is like-V wise rocked counter-clockwise. The counterclockwise rocking of shaft 250 disengages the left shift clutch and the clear clutch push rods heretofore described. The release of left shift clutch |16 (Fig. 3B) and clear clutch push rod disengagement of their rethe inuence of their springs. Simultaneously, the release of shaft 200 and its counter-clockwise rotation, permits spring |63 to cause disengagement of the clutch |52 and the opening of switch |62. Shaft 250 is then restored to its original position by spring 206 (Fie. 3B) and the parts of the power-setting unit all reoccupy the original position shown in Figs. 5 and 6.

| (Fig. 3A) cause Dividend entry Dividend entry key (Fig. 7) when depressed is held down by means of a well-known latch 290, and thru a pin and slot connection 29| rocks the hellora `k |90v which, as previously explained, rocks the shaft 200 to release the power setting unit. thereby resulting in a return clear operation. AS disclosed in the patent to Machado 2,363,737, the dividend entry key ||5 also condito cause a right shift from the left end position to the tabulated position determined by the selected tabulator key ||9 (Fig. 1) wherevv a. cam 292 (Fig. 7) is unlatched and is rotated counter-clockwise by a spring 293. The cam 292 engages a roller 294 on a lever 295 seenredtQ the: shaft 2.95 (Figs. 2B and 7) which operates the gatey |42 previously described to dividend. rlhe lever 295 (Fig. 251 which engages a pin 29.0 and release the key |,|5 which returns under the influence of its 7), has an upper arm .spring 2,99). Upon return ofthe key l5 the shaft 20.0, restores,A as` previously described, and the parts. of the` power setting unit return to their original positions shown in Figures 5 and 6.

Mutiplie keys- As previously explained, thc multiplier key |23 (Fig.l 1;) causes a return clear operation as a prea multiplication. Key |23 (Fig. 1 1.) has a pin andl slot connection 300 with 'a lever 30| pivoted to the frame at 302. A roller 303 on the lever 30| engages an arm 304- secured to the Shaft 200. Accordingly, depression of the rotation of the shaft 200 and, as

clear operation. As disclosed in the above cited patent to Friiden et al. 2,399,917, mechanism is provided' which comes into operation. at, the conclusion of the clear cycle or at the end, of a shift of. the, carriage, to the left end position when no clear cycle is to be performed,

QQUSQS. o return4 and causes rotation of the shaft 305 (Fig. 11). This shaft has an arm 30B secured thereto hav-'- ing an ear 301 underlying a rearwardly extending arm of a bellcrank 308 rotatably mounted on the shaft 250. The other arm of the bellcrank 308 has a pin 309 which normally is in engagement with a slot 3|0 of an arm 3|| pivoted at 3|2 on arm 3|3 secured to the shaft 3|4. Shaft 3|4 (Fig. 14) has secured thereto a latch 3|5 which, when rotated, releases a pin 3|6 on an arm 3H which, as described in the aforesaid patent, is then free to rock clockwise and initiate the multiplication operation.

As previously explained, the multiplier keys |24, |25 do not cause clearing of the accumulator upon return of the carriage to the left end position. Accordingly, while means are provided to cause operation of the power setting unit, additional means is provided under control of these keys to override control of the clear mechanism to prevent its operation as will now be explained. As explained in the patent to Friden et al. 2,399,917, depression of either key |24 or key |25 (Fig. 14) causes rocking of lever 3|8. In accordance with this invention lever 3 0 is provided with a depending portion 3|9 which engages the pin 320 on a lever 205 secured to shaft 200 so that depression of either key will rock shaft 200 and cause operation of the power setting unit. The arm 3|8 has a pin 32| engaging the forked end of a link 322 secured to an arm 323 fastened to a shaft 324. Referring to Figure 11, shaft 324 also has secured thereto arm 325 provided with a pin 326 so that upon depression of either key shaft 324 is rocked counter-clockwise in Figure le, clockwise in Figure 11 whereupon the pin 32E engages an arm 321 of the pusher arm 28| rocking it counter-clockwise on its pivot 282 to remove it from engagement with the clear clutch push rod so that while the shaft 250 may be rocked, the push rod |80 will not be operated due to the factv that its control has been removed from the pusher arm 28 When any one of the keys |23, |24, and |25 is depressed, it is latched down during the ensuing multiplying operation and is automatically released at the end of the operation by known mechanism of the kind disclosed in the aforesaid Friden, Patent 2,399,917.

The multiplier correction key |26 (Fig. 11) has a pin and slot connection 328 with a bellcrank 329 pivoted at 330. The depending arm of the bellcrank has pin 33| thereon which underlies the end of the arm 3| and which lifts the notch 3 |.0 out of engagement with the pin 309 when the multiplier correction key is depressed. This prevents initiation oi' aL multiplying operation at the conclusionv of the clear cycle at which time the shaft 305 is rotated, as previously described. The pin 33|5 in lifting the rear end ofv the arm 3|| brings it into engagement with a pin 332 (see also Fig. 12)y ona fork 333 which, when rocked clockwise, lifts the return feed pawl 334 into operative engagement with the rack 335 on the multiplier pin carriage 336. When the key |25 is depressed and the bellcrank. 329 is rocked counter-clockwise the shaft 20,0 isy rocked by reason of a link 33T which. interconnects the bellcraxrk and the arm 304. This, as previously described,r causes operationv of the power setting unit' and a return clear operation is initiated, however', it is undesirable toV cause clearance of the values in the accumulator in this operation so the link 337-r (Fig. lll) is provided. with a.A pin 333 which engages the arm 321i of the pusher arm 28| in order to move it to inoperative position. When the shaft 200 is rocked to initiate the operation, the main drive shaft |45 (Fig. 12) is started rotating, and thru the bevel gear connection 252 rotates the shaft 25| which, it will be recalled, has a bevel gear connection 260 to ,the shaft 259. Secured to the shaft 259 is a cam 339 which is so disposed that when the pin carriage 336 has been returned to its farthest right position the cam 339 is in cooperative relation with an ear 349 on a lever 34| having a pin 342 therein which extends laterally across the indicator dials |22, and as shown in Figure 13 acts as a bail to restore all of the dials to zero where they become latched by the latches 343 (Fig. l2).

Disabling keyboard clear It -is desirable when the multiplier correction key |26 is depressed that the value set in the keyboard |09 be retaine l therein regardless of the adjustment of the add key H0. For this reason the lever 326 (Fig. 1l) has a shoulder 350 overlying the end of a lever 35| secured to a shaft 352 which extends laterally across the front of the machine to the right side Where it appears in Figure 8.

The normal operation of the automatic keyboard clear mechanism under the control of the add key H is as follows. The add key ||0 (Fig.

9) supports, by means of a pin-and-slot connection 353, the forward end of a long link 35d. The long link 354 is urged forwardly (to the right in Fig. 9) by a spring tensioned between a lever 359 and the frame plate |3|. The link is held rearwardly, when in the raised position, by means of the cam face 355 thereon engaging the roller 356 mounted on the frame. When the add key ||0 is depressed, and link 354 lowered, the spring is permitted to move the link forwardly. The downward movement results in engaging a notch 351 in the link 354 with a pin 358, the purpose of which will be presently described. When the link 354 moves forwardly it rocks the foot of a lever 359 pivoted at 36D into the path of a pin 36| secured to a member 362 on the main drive f shaft |45 so that as the drive shaft |45 rotates counter-clockwise (Fig. 9) the pin 36| rocks the lever 359 near the end of the cycle and this causes the link 354 to draw the pin 358 rearwardly. Referring now to Figure 8, pin 358 is secured to a bellcrank 363 pivoted at 364 to the side frame |3|. Pivotally mounted at 365 on the bellcrank 363 is an arm 366 which has a lip 361 on itsfront edge which is adapted to engage an extension 368 on the bail 369 (Fig. 2A) which operates the latch slides 319 to release the keys of the keyboard. If the arm 366 is rocked counter-clockwise, in Figure 8, on its pivot, the lip 361 will pass beneath the extension 368 and fail to clear the keyboard. The function of the shaft 352 which is rocked clockwise in Figure 8 upon depression of the multiplier correction key can now be explained. Secured to the right end of the shaft 352 is a bellcrank 31| having a fork 312 engaging lug 313 on a lever 314 pivoted at 315. The lever 314 has an ear 316 which engages the lip 351 ofthe arm 365 to rock the arm 366 counter-clockwise when the shaft 352 is rotated clockwise which causes the lip to reciprocate underneath the extension 368 if the add key ||0 is in its depressed position where it has connected the link 354 to the pin 358 (Fig. 9). In addition, when the add key ||9 is depressed the latch 311 is permitted to become operative under the influence of its spring 318 so that when the shaft 352 and the bellcrank 31| are rotated clockwise upon depression of the multiplier correction key, the shoulder 319 on the latch 311 Will engage a pin 38D on the bellcrank 31| to hold the arm 366 in its inoperative position. On the arm 366 is a square pin 38| which engages the hooked end 382 of the' latch 311 and unlatches it at the end of the rearward stroke of the arm 366 so that in effect, when the latch 311 is operative it is delatched at the end of every stroke of the arm 366. Thus, so long as the multiplier correction key |26 is latched down, and ear 316 depressed, the lip 361 will have passed under the extension 368 by the time the square pin 38| encounters the hooked end 382 of the latch 311. Therefore the lipv 361 is prevented from operating the keyboard clearing bail 368-369 even though the fork 312 is temporarily unlatched cyclically. During the last cycle of a multiplier correction operation, the multiplier correction key |26 is released prior to the opeartion of the link 354 by the pin 36| and lever 359. During this cycle, after the key |26 has been released, the latch311 effectively holds the fork 312 in positionfor maintaining the link 366 inoperative with respect to the keyboard clearing bail 3 {5B- 366, thus preventing the last cycle operation of the link 354 from clearing the keyboard.

In the operation of the multiplier keys |23, |24, |25, the return clear key 3 and the dividend entry key l 5, the automatic keyboard clear mechanism is disabled during the operation but is enabled in the last cycle of the operation. This is effected by the following mechanism. The shaft 250 (Fig. 9) has secured thereto an arm 383 connected by a link 384 to an arm 385y (Fig. 7) pivoted on the side frame |3| at 396 and having a link 361 pivoted thereto at 388, the other end of the link is pivoted at 389 to an arm 390 rotatably mounted on the shaft 39|. The upstanding end 392 of the link 381 has a pin 393 which is shown in section in Figure 8. Therefore, when any of the operation keys referred to, which bring the power setting unit into operation, are depressed the shaft 250 is rocked, resulting in elevation of the pin 393 (Fig. 8) thereby rocking the arm 366 to its inoperative position so that during the time any of these keys are latched down the keyboard clearing mechanism is inoperative until they are unlatched, which occurs in the last cycle of the operation when the keyboard clear mechanism becomes operative.

Division stop Whenever the machine is performing a division operation, a lever |26 (Fig. 1) can be moved either rearwardly to instantly stop the machine in the current cycle, or forwardly to conclude a division operation after a true quotient ligure has been determined in the order in which the machine is then operating.

Referring now to Figures 8 and 9 and to the previously cited patent Friden 2,229,890 for details of the automatic division mechanism. When the division keys ||4 (Fig. l) are depressed the division operation control member 394 (Fig. 8) is rocked counter-clockwise on its pivot. As explained in said patent, the forked end of the lever 394 engages a pin on a gate-adjusting slide and moves the latter to adjust the gate |42 (Fig. 2B) to the subtract position. When overdraft occurs means are provided which move the lever 394 rearwardly to adjust the gate to the add position, and at the conclusion of the corrective addition cycle the lever 394 is moved forwardly to adjust the gate to neutral during the shift cycle. A latch 395 is adapted to engage a semi-circular pin 396 in the lever 394 when it is rockedr counterclockwise upon depression of the division key I4. Latch 395 is urged clockwise on its pivot by a spring 391 and has an ear 398 which cooperates with a nose 399 on the lever which is pivoted at 400. When the operator moves the lever |20 rearwardly to stop the division operation, the lower cam face of the nose 399 engages the ear 398 to rotate the latch 395 thereby releasing the pin 396. However, when it is desired to terminate the division operation with the true quotient gure the lever |20 is moved forwardly or counterclockwise on its pivot 400. An arm 402 is connected to the lever |20 by a spring 403 which urges the arm 402 counter-clockwise on its pivot. The counter-clockwise rotation is limited by an ear 404 on the arm 402 engaging the lower edge of lever |20. When the lever |20 is moved counter-clockwise a shoulder 405 on the arm 402 engages the underside of the ear 3.90 on the latch 395 and the spring 403 is tensioned. At the end of the cycle in which the overdraft occurs the arm 394 is moved rearwardly so that the pin 396 causes the latch 395 to rotate counter-clockwise. When the ear 338 frees the shoulder 405 the arm 402 is rotated counter-clockwise by its spring 403 until a second shoulder 400 engages the ear 399. At the end of the cycle of corrective addition the lever 394 moves forwardly and the pin 390 moves oif the latch 395 which is held out by the arm 402 so that the arm 394- may return to its original position thereby stopping the division operation after the corrective addition with the true quotient figure in the counter.

In the well known standard Friden commercial machine7 means controlled by the division key is provided for rocking the lever 424 counter-clockwise (Fig. 8) to disable the keyboard clearing mechanism during all but the last cycle of a division operation. During the lastc-ycle the keyboard clearing mechanism is re-enabled and the keyboard is cleared.

In both division stop operations it is desirable not to clear the keyboard because the operator may wish to employ the divisor set therein to continue the division operation. Accordingly, the lever |20 is provided with a pin 4|0 which extends thru a slot in the side frame |3| andengages in the forked end of a lever 4H (Fig. 9) pivoted. at 4|2. The lever 41|- has an ear 4|'3 which engages a lug 4|4 on an arm 4|5 which has a finger 4|5 overlying the end of a lever 4|1 pivoted at 4 3.` When the lever |20 (Fig. 9)- is moved rearwardly the pin 4 l 0 rocks the lever 4| I counterclockwise, the arm 4I-5 clockwise and the lever 4|1 counter-clockwise. The parts are held in this position by a latch 420 which has a shoulder 42| that engages an ear 422. on the arm 4|5. The lever 4|1 has a pin 423 which extends laterally thru a hole in the side frame |3| as seen in Figure 8. As there viewed,y when the lever |20 is moved to its rearward position the pin 423 moves upwardly, in so doing it rocks the lever 424 counter-clockwise on its pivot 364 and the lever 424 has a pin 425 which rocks alever 426 clockwise. The lever 420 engages a pin 421 on the lever 306 which is rocked counter-clockwise on its pivot 369 thus lowering the lip 361 below the extension 368 so that if the add key is depressed the. lip 361 will move rearwardly beneath the extension 363 as the link 354 (Fig. 9) moves rearwardly. At the end of its rearward stroke the rear end of the link 354. engages an ear 428 formed on an arm of the latch 420 and rotates the latch counter-clockwise on its pivot 4 2 thereby releasing the arm 4|5.

Even if, during the performance of a cycle in a division operation, the division stop lever |20 should be moved rearwardly and then allowed to return quickly before the completion of the current cycle, that is, before the pin 30| on the rotary member 302 encounters the lower end of the lever 359, the keyboard nevertheless, will not be cleared. This is because the latch i420, having been set in latching position by the rearward movement of the stop lever |20, will maintain the keyboard clearing mechanism disabled until the end of the last cycle. When the pin 36| rocks the lever 359 at the end of the last cycle, causing releasing of the latch 420, as previously explained, the lip 301 on the arm 366 will already have passed idly under the extension 368 on the keyboard clearing bail 369. Consequently, the rocking of the lever 359 in the last cycle which releases the latch 420 to render the keyboard clear disabling means ineffective will not cause operation of the keyboard clear mechanism.

When the lever |20 is moved forwardly it is held in its forward position by the detent 40| (Fig. 8). Forward movement of the lever |20 (Fig. 9) causes counterclockwise rotation of the lever 4H and sets all of the parts, as previously described, with the exception of the latch 420 which is held disabled by engagement of the pin 4m with av lug 429 on the latch 420.

I claim:

1. In a calculating machine, a motor, a shiftable register, a main clutch, a register shifting mechanismv including a lefty shift clutch, a register clearing mechanism including a clear clutch, clutch operating means for said left shift clutch and. said clear clutch, a plurality of control keys for initiating operation of the machine including shifting of the register to its extreme left position and clearing the register, means positioned by said control keys for initiating operation of said motor and engaging said main clutch, a reciprocabl'e interponent driven by said motor, and meansrv operable by said control keys for positioning said interponent to engage said clutch operating means.

2. In a calculating machine having a motor, a shiftable register, a main clutch, a register shifting mechanism including a left shift clutch, a register clearing mechanism including a clear clutch, and a plurality of control keys for initiating operation of the machine including shifting of' the register to its eXtreme left position and clearing the register,A the combination which comprises. a common member positioned by said control keys, means positioned by said common member for initiating operation of said motor and engaging said main clutch, clutch operating means for said left shift clutch and said clear clutch, a reciprocable interponent driven by said motor, means' operable by said common member for positioning said interponent to engage said ciutch operating means, a latch for said clutch operating means, and means controlled by said common member for controlling the engagement of said latch.

3. In a calculating machine having a motor, an operating mechanism, a clutch between said motor and said operating mechanism, and control keys for initiating operation of said operating mechanism, the improvement which comprises an eccentric driven by said motor,y a hook mounted onsaid eccentric, a member positioned by said 

